Hand telephone



Jan. H. SENGEBUSCH HAND TELEPHONE Filed May 29 1924 2 Sheets-Shea. l4

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Patented Jan. A11, 1927.

UNrraD STATES PATENT OFFICE.

HANS SENGEBUSCH, CF CHICAGO, ILLINOIS, ASSIGNOR T AUTOMATIC ELECTRIC INC., OF CHICAGO, ILLINOIS, A CORPORATION 0F DELAWARE.

HAND TELEPHONE.

The present invention relates to hand. telephones provided with impulse transmitters and adapted for use with automatic telephone systems. These hand telephones are 6 particularly, although not excluslvely, used by telephone repair men.

The general object of the invention 1s to provide a new and improved hand telephone which has the advantages, among others,

l0 'of compactness, good balance, and simple construction. In addition, the parts of this hand telephone are ,very readily accessible for repair, and the whole make-up is exceedingly neat in appearance. f

A particular feature of the invention is the construction of the shell in halves, making each half a simple casting which may be manufactured very cheaply.

p Another advantage of casting the shell in halves isthe convenience of accessibility, it being possible to assemble all parts and to even complete the wiring operation before.

fastening the two halves together.

The invention will be best understood from the following detailed description taken in connection with the accompanying drawings comprising Figs. 1 to 6, inclusive.

Fig. 1 is a front view of the hand telephone with part of the handle broken away; Fig. 2Lis a side view of- Fig. 1 as seen when looking in the direction indicated by arrows A-A; Fig. 3 is a side view of Fig. 2 as seen when looking' in the direction indicated by arrows B-B; Fig. 4 is a cross-sectional view of the hand telephone as seen when looking in the direction indicated by arrows F-F in Fig. 1, the resistance coil, condenser, and a portion of the transmitter being shown in full and the .terminal block 18' being shown in cross section when looking in the direction 'indicated by the arrows H-H, Fig. 6;

Fig. 5 is a view of that half of the hand telephone at the left of the dotted lineG-G as seen when looking in the direction indicated by arrows D-D, showing the transmitter complete and in place, and the push button switch, with its micarta cover 36 partly broken away; while Fig. 6 shows that part of the telephone lying to the right of line G--G as it appears when looking in the direction indicated by arrows E-,-E.

As above pointed out the housing or shell for supporting the various elements of the t telephone is made un of two castings. As f will be noted from Figs. 1, 2, 4, and 5 the casting 1 consists of a channel member having a cup-like opening at one end in the form` of a watch-case receiver shell, while the other end is in the form 'of a cup for receiving a telephone transmitter unit, such as the unit 3.

Hand telephones of this kind are usually provided with two but-ton operated switches, one of which, when its button is depressed, short circuits a condenser located in the receiver and transmitter circuit, and the other, when depressedopens a short circuit around a resistance located in the line circuit.

These push button spring combinations in,

the present case are located in the channel connecting the above described cups and are mounted on a block fixed to the casting by the screw 30. The ltwo buttons 9and 10 for operating the push button switches are held in place by the pairs of springs 11 and 12 which they operate, as is clearly shown in Fig.l 5.y The location of these buttons is such that 'they may be conveniently operated one by the thumb and the other by the foreinger. These springs are provided with a micarta cover 36 which is held in place by screws 14. l A

The transmitter unit is held in' place by two screws 4 and 4', respectively, which are provided with circular nuts 5 and 5 which are drilled and tapped on an eccentric so that when the screws are tightened up the nuts bear against the transmitter unit as illustrated in Figs. 4 and 5.

Casting 2, which is shown in Figs-2, 3, 4, and 6, consists of a channel member provided at one end with two diametrically disposed winged extensions 31 and 32 which serve, when the two castings are assembled together as a cover for the transmitter cup portion of casting 1. The other end of cast- 1ng 2 is cup shaped for receiving a-standard dial type calling device 33. The channel .portion of this casting which extends from the cup shaped end to the other extreme end serves as a receptacle for the condenser 15,

and the. unit com rising distributing block 18, resistance win ing 19, and terminal block 18 which are held in place by the screws 17 and 17 and fiber washers 16 and 16, respectively.

The two castings or halves of the hand telephone are not connected together until their associated parts are in place and all wiring between the two halves completed.

When this is done the two halves are placed together and held by screws 38, 38', 39, and 39', respectively.

The openings in the bottom end of the terminal block 18 allow the line conductor terminals, such as 20, to be led in to the terminals on the inside 'of the instrument and the openings (see Figs. 3 and 4) in the casting 2 permit the line terminals to be fixed in place or removed without opening up'the instrument.

It is of course understood that the hand telephone herein shown and described may be modified as regards its design and form without departing from thespirit of the iuvention as defined in the claims.

W hat is claimed is:

1. ln a hand telephone, two castings each provided with a plurality of cavitiesa telephone receiver, a telephone transmitter, a pair ot push button switches in the cavities ot' one casting, an impulse transmitter, a condenser, a terminal block, and a resistance unit in the cavities of the other casting, and means for fitting said castings together as a unit.

2. In a hand telephone, two castings each provided with a plurality of cavities, a telephone receiver, a telephone transmitter, a pair of push button switches in the cavities of one casting, an impulse transmitter, a

condenser, la terminal block, and a resistance unit in the cavities of the other casting, and means for fitting said castings together -as a unit so that the receiver and impulse a housing for a pair of push button switches, the other casting having a portion, for covering the back of the transmitter housing; a ring member serving as a housing for a calling device, and a channel in said casting for receiving a condenser and an induction coil, and means for securing said castings together. f

4. In a hand telephone set, a transmitter, a cavity for holding said transmitter, and means comprising screws and cooperating eccentric nuts for securing said transmitter in place.

5. A hand telephone comprising two major units, one unit comprising a shell, an impulse transmitter, a condenser, a resistance coil, and terminalblocks, the other unit comprising a shell, a receiver, a transmitter and push button switches, and means :tor fastening said major units together as a whole.

6. A hand telephone comprising a casting provided with cavities for receiving transmitter and receiver units respectively, a threaded extension formed from a part ot said casting with cooperating means for holding the receiver unit in place, eccentric devices for holding the transmitter in place and perforations in said casting through which sound waves may pass to the transmitter unit.

7. In a hand telephone a voice current transmitter, a receiver and an impulse transmitter, a single receptacle for holding both the voice current transmitter and the receiver, and a second receptacle for completely inclosing the transmitter and for receiving the impulse transmitter.

In witness whereof, I hereunto subscribe my name this 22nd day oi May, A. D., 1924.

HANS I SENGEBUSCH.- 

